Borders of Multiple Visual Areas in Humans Revealed by Functional Magnetic Resonance Imaging

American Association for the Advancement of Science (AAAS) - Tập 268 Số 5212 - Trang 889-893 - 1995
Martin I. Sereno1, Anders M. Dale1,2, John B. Reppas3, Kenneth K. Kwong4, John W. Belliveau4, Thomas J. Brady4, Bruce R. Rosen4, Roger B. H. Tootell4
1Cognitive Science 0515, University of California, San Diego, La Jolla, CA 92093-0515, USA.
2Department of Neurophysiology, University of Oslo, 0316 Oslo, Norway.
3Harvard-Massachusetts Institute of Technology, Division of Health Sciences and Technology, Boston, MA 02115, USA
4Massachusetts General Hospital Nuclear Magnetic Resonance Center, Charlestown, MA 02129, USA

Tóm tắt

The borders of human visual areas V1, V2, VP, V3, and V4 were precisely and noninvasively determined. Functional magnetic resonance images were recorded during phase-encoded retinal stimulation. This volume data set was then sampled with a cortical surface reconstruction, making it possible to calculate the local visual field sign (mirror image versus non-mirror image representation). This method automatically and objectively outlines area borders because adjacent areas often have the opposite field sign. Cortical magnification factor curves for striate and extrastriate cortical areas were determined, which showed that human visual areas have a greater emphasis on the center-of-gaze than their counterparts in monkeys. Retinotopically organized visual areas in humans extend anteriorly to overlap several areas previously shown to be activated by written words.

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American Association for the Advancement of Science (AAAS)

Tập 268 Số 5212

889-893

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